summaryrefslogtreecommitdiff
path: root/drivers/video/cg6.c
blob: 9eaa63ab08fa2dabe13d8b9be8d4cebfdef43fcc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
/* cg6.c: CGSIX (GX, GXplus, TGX) frame buffer driver
 *
 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
 *
 * Driver layout based loosely on tgafb.c, see that file for credits.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/of_device.h>

#include <asm/io.h>
#include <asm/fbio.h>

#include "sbuslib.h"

/*
 * Local functions.
 */

static int cg6_setcolreg(unsigned, unsigned, unsigned, unsigned,
			 unsigned, struct fb_info *);
static int cg6_blank(int, struct fb_info *);

static void cg6_imageblit(struct fb_info *, const struct fb_image *);
static void cg6_fillrect(struct fb_info *, const struct fb_fillrect *);
static int cg6_sync(struct fb_info *);
static int cg6_mmap(struct fb_info *, struct vm_area_struct *);
static int cg6_ioctl(struct fb_info *, unsigned int, unsigned long);
static void cg6_copyarea(struct fb_info *info, const struct fb_copyarea *area);

/*
 *  Frame buffer operations
 */

static struct fb_ops cg6_ops = {
	.owner			= THIS_MODULE,
	.fb_setcolreg		= cg6_setcolreg,
	.fb_blank		= cg6_blank,
	.fb_fillrect		= cg6_fillrect,
	.fb_copyarea		= cg6_copyarea,
	.fb_imageblit		= cg6_imageblit,
	.fb_sync		= cg6_sync,
	.fb_mmap		= cg6_mmap,
	.fb_ioctl		= cg6_ioctl,
#ifdef CONFIG_COMPAT
	.fb_compat_ioctl	= sbusfb_compat_ioctl,
#endif
};

/* Offset of interesting structures in the OBIO space */
/*
 * Brooktree is the video dac and is funny to program on the cg6.
 * (it's even funnier on the cg3)
 * The FBC could be the frame buffer control
 * The FHC could is the frame buffer hardware control.
 */
#define CG6_ROM_OFFSET			0x0UL
#define CG6_BROOKTREE_OFFSET		0x200000UL
#define CG6_DHC_OFFSET			0x240000UL
#define CG6_ALT_OFFSET			0x280000UL
#define CG6_FHC_OFFSET			0x300000UL
#define CG6_THC_OFFSET			0x301000UL
#define CG6_FBC_OFFSET			0x700000UL
#define CG6_TEC_OFFSET			0x701000UL
#define CG6_RAM_OFFSET			0x800000UL

/* FHC definitions */
#define CG6_FHC_FBID_SHIFT		24
#define CG6_FHC_FBID_MASK		255
#define CG6_FHC_REV_SHIFT		20
#define CG6_FHC_REV_MASK		15
#define CG6_FHC_FROP_DISABLE		(1 << 19)
#define CG6_FHC_ROW_DISABLE		(1 << 18)
#define CG6_FHC_SRC_DISABLE		(1 << 17)
#define CG6_FHC_DST_DISABLE		(1 << 16)
#define CG6_FHC_RESET			(1 << 15)
#define CG6_FHC_LITTLE_ENDIAN		(1 << 13)
#define CG6_FHC_RES_MASK		(3 << 11)
#define CG6_FHC_1024			(0 << 11)
#define CG6_FHC_1152			(1 << 11)
#define CG6_FHC_1280			(2 << 11)
#define CG6_FHC_1600			(3 << 11)
#define CG6_FHC_CPU_MASK		(3 << 9)
#define CG6_FHC_CPU_SPARC		(0 << 9)
#define CG6_FHC_CPU_68020		(1 << 9)
#define CG6_FHC_CPU_386			(2 << 9)
#define CG6_FHC_TEST			(1 << 8)
#define CG6_FHC_TEST_X_SHIFT		4
#define CG6_FHC_TEST_X_MASK		15
#define CG6_FHC_TEST_Y_SHIFT		0
#define CG6_FHC_TEST_Y_MASK		15

/* FBC mode definitions */
#define CG6_FBC_BLIT_IGNORE		0x00000000
#define CG6_FBC_BLIT_NOSRC		0x00100000
#define CG6_FBC_BLIT_SRC		0x00200000
#define CG6_FBC_BLIT_ILLEGAL		0x00300000
#define CG6_FBC_BLIT_MASK		0x00300000

#define CG6_FBC_VBLANK			0x00080000

#define CG6_FBC_MODE_IGNORE		0x00000000
#define CG6_FBC_MODE_COLOR8		0x00020000
#define CG6_FBC_MODE_COLOR1		0x00040000
#define CG6_FBC_MODE_HRMONO		0x00060000
#define CG6_FBC_MODE_MASK		0x00060000

#define CG6_FBC_DRAW_IGNORE		0x00000000
#define CG6_FBC_DRAW_RENDER		0x00008000
#define CG6_FBC_DRAW_PICK		0x00010000
#define CG6_FBC_DRAW_ILLEGAL		0x00018000
#define CG6_FBC_DRAW_MASK		0x00018000

#define CG6_FBC_BWRITE0_IGNORE		0x00000000
#define CG6_FBC_BWRITE0_ENABLE		0x00002000
#define CG6_FBC_BWRITE0_DISABLE		0x00004000
#define CG6_FBC_BWRITE0_ILLEGAL		0x00006000
#define CG6_FBC_BWRITE0_MASK		0x00006000

#define CG6_FBC_BWRITE1_IGNORE		0x00000000
#define CG6_FBC_BWRITE1_ENABLE		0x00000800
#define CG6_FBC_BWRITE1_DISABLE		0x00001000
#define CG6_FBC_BWRITE1_ILLEGAL		0x00001800
#define CG6_FBC_BWRITE1_MASK		0x00001800

#define CG6_FBC_BREAD_IGNORE		0x00000000
#define CG6_FBC_BREAD_0			0x00000200
#define CG6_FBC_BREAD_1			0x00000400
#define CG6_FBC_BREAD_ILLEGAL		0x00000600
#define CG6_FBC_BREAD_MASK		0x00000600

#define CG6_FBC_BDISP_IGNORE		0x00000000
#define CG6_FBC_BDISP_0			0x00000080
#define CG6_FBC_BDISP_1			0x00000100
#define CG6_FBC_BDISP_ILLEGAL		0x00000180
#define CG6_FBC_BDISP_MASK		0x00000180

#define CG6_FBC_INDEX_MOD		0x00000040
#define CG6_FBC_INDEX_MASK		0x00000030

/* THC definitions */
#define CG6_THC_MISC_REV_SHIFT		16
#define CG6_THC_MISC_REV_MASK		15
#define CG6_THC_MISC_RESET		(1 << 12)
#define CG6_THC_MISC_VIDEO		(1 << 10)
#define CG6_THC_MISC_SYNC		(1 << 9)
#define CG6_THC_MISC_VSYNC		(1 << 8)
#define CG6_THC_MISC_SYNC_ENAB		(1 << 7)
#define CG6_THC_MISC_CURS_RES		(1 << 6)
#define CG6_THC_MISC_INT_ENAB		(1 << 5)
#define CG6_THC_MISC_INT		(1 << 4)
#define CG6_THC_MISC_INIT		0x9f

/* The contents are unknown */
struct cg6_tec {
	int tec_matrix;
	int tec_clip;
	int tec_vdc;
};

struct cg6_thc {
	u32	thc_pad0[512];
	u32	thc_hs;		/* hsync timing */
	u32	thc_hsdvs;
	u32	thc_hd;
	u32	thc_vs;		/* vsync timing */
	u32	thc_vd;
	u32	thc_refresh;
	u32	thc_misc;
	u32	thc_pad1[56];
	u32	thc_cursxy;	/* cursor x,y position (16 bits each) */
	u32	thc_cursmask[32];	/* cursor mask bits */
	u32	thc_cursbits[32];	/* what to show where mask enabled */
};

struct cg6_fbc {
	u32	xxx0[1];
	u32	mode;
	u32	clip;
	u32	xxx1[1];
	u32	s;
	u32	draw;
	u32	blit;
	u32	font;
	u32	xxx2[24];
	u32	x0, y0, z0, color0;
	u32	x1, y1, z1, color1;
	u32	x2, y2, z2, color2;
	u32	x3, y3, z3, color3;
	u32	offx, offy;
	u32	xxx3[2];
	u32	incx, incy;
	u32	xxx4[2];
	u32	clipminx, clipminy;
	u32	xxx5[2];
	u32	clipmaxx, clipmaxy;
	u32	xxx6[2];
	u32	fg;
	u32	bg;
	u32	alu;
	u32	pm;
	u32	pixelm;
	u32	xxx7[2];
	u32	patalign;
	u32	pattern[8];
	u32	xxx8[432];
	u32	apointx, apointy, apointz;
	u32	xxx9[1];
	u32	rpointx, rpointy, rpointz;
	u32	xxx10[5];
	u32	pointr, pointg, pointb, pointa;
	u32	alinex, aliney, alinez;
	u32	xxx11[1];
	u32	rlinex, rliney, rlinez;
	u32	xxx12[5];
	u32	liner, lineg, lineb, linea;
	u32	atrix, atriy, atriz;
	u32	xxx13[1];
	u32	rtrix, rtriy, rtriz;
	u32	xxx14[5];
	u32	trir, trig, trib, tria;
	u32	aquadx, aquady, aquadz;
	u32	xxx15[1];
	u32	rquadx, rquady, rquadz;
	u32	xxx16[5];
	u32	quadr, quadg, quadb, quada;
	u32	arectx, arecty, arectz;
	u32	xxx17[1];
	u32	rrectx, rrecty, rrectz;
	u32	xxx18[5];
	u32	rectr, rectg, rectb, recta;
};

struct bt_regs {
	u32	addr;
	u32	color_map;
	u32	control;
	u32	cursor;
};

struct cg6_par {
	spinlock_t		lock;
	struct bt_regs		__iomem *bt;
	struct cg6_fbc		__iomem *fbc;
	struct cg6_thc		__iomem *thc;
	struct cg6_tec		__iomem *tec;
	u32			__iomem *fhc;

	u32			flags;
#define CG6_FLAG_BLANKED	0x00000001

	unsigned long		physbase;
	unsigned long		which_io;
	unsigned long		fbsize;
};

static int cg6_sync(struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_fbc __iomem *fbc = par->fbc;
	int limit = 10000;

	do {
		if (!(sbus_readl(&fbc->s) & 0x10000000))
			break;
		udelay(10);
	} while (--limit > 0);

	return 0;
}

/**
 *	cg6_fillrect -	Draws a rectangle on the screen.
 *
 *	@info: frame buffer structure that represents a single frame buffer
 *	@rect: structure defining the rectagle and operation.
 */
static void cg6_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_fbc __iomem *fbc = par->fbc;
	unsigned long flags;
	s32 val;

	/* CG6 doesn't handle ROP_XOR */

	spin_lock_irqsave(&par->lock, flags);

	cg6_sync(info);

	sbus_writel(rect->color, &fbc->fg);
	sbus_writel(~(u32)0, &fbc->pixelm);
	sbus_writel(0xea80ff00, &fbc->alu);
	sbus_writel(0, &fbc->s);
	sbus_writel(0, &fbc->clip);
	sbus_writel(~(u32)0, &fbc->pm);
	sbus_writel(rect->dy, &fbc->arecty);
	sbus_writel(rect->dx, &fbc->arectx);
	sbus_writel(rect->dy + rect->height, &fbc->arecty);
	sbus_writel(rect->dx + rect->width, &fbc->arectx);
	do {
		val = sbus_readl(&fbc->draw);
	} while (val < 0 && (val & 0x20000000));
	spin_unlock_irqrestore(&par->lock, flags);
}

/**
 *	cg6_copyarea - Copies one area of the screen to another area.
 *
 *	@info: frame buffer structure that represents a single frame buffer
 *	@area: Structure providing the data to copy the framebuffer contents
 *		from one region to another.
 *
 *	This drawing operation copies a rectangular area from one area of the
 *	screen to another area.
 */
static void cg6_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_fbc __iomem *fbc = par->fbc;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&par->lock, flags);

	cg6_sync(info);

	sbus_writel(0xff, &fbc->fg);
	sbus_writel(0x00, &fbc->bg);
	sbus_writel(~0, &fbc->pixelm);
	sbus_writel(0xe880cccc, &fbc->alu);
	sbus_writel(0, &fbc->s);
	sbus_writel(0, &fbc->clip);

	sbus_writel(area->sy, &fbc->y0);
	sbus_writel(area->sx, &fbc->x0);
	sbus_writel(area->sy + area->height - 1, &fbc->y1);
	sbus_writel(area->sx + area->width - 1, &fbc->x1);
	sbus_writel(area->dy, &fbc->y2);
	sbus_writel(area->dx, &fbc->x2);
	sbus_writel(area->dy + area->height - 1, &fbc->y3);
	sbus_writel(area->dx + area->width - 1, &fbc->x3);
	do {
		i = sbus_readl(&fbc->blit);
	} while (i < 0 && (i & 0x20000000));
	spin_unlock_irqrestore(&par->lock, flags);
}

/**
 *	cg6_imageblit -	Copies a image from system memory to the screen.
 *
 *	@info: frame buffer structure that represents a single frame buffer
 *	@image: structure defining the image.
 */
static void cg6_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_fbc __iomem *fbc = par->fbc;
	const u8 *data = image->data;
	unsigned long flags;
	u32 x, y;
	int i, width;

	if (image->depth > 1) {
		cfb_imageblit(info, image);
		return;
	}

	spin_lock_irqsave(&par->lock, flags);

	cg6_sync(info);

	sbus_writel(image->fg_color, &fbc->fg);
	sbus_writel(image->bg_color, &fbc->bg);
	sbus_writel(0x140000, &fbc->mode);
	sbus_writel(0xe880fc30, &fbc->alu);
	sbus_writel(~(u32)0, &fbc->pixelm);
	sbus_writel(0, &fbc->s);
	sbus_writel(0, &fbc->clip);
	sbus_writel(0xff, &fbc->pm);
	sbus_writel(32, &fbc->incx);
	sbus_writel(0, &fbc->incy);

	x = image->dx;
	y = image->dy;
	for (i = 0; i < image->height; i++) {
		width = image->width;

		while (width >= 32) {
			u32 val;

			sbus_writel(y, &fbc->y0);
			sbus_writel(x, &fbc->x0);
			sbus_writel(x + 32 - 1, &fbc->x1);

			val = ((u32)data[0] << 24) |
			      ((u32)data[1] << 16) |
			      ((u32)data[2] <<  8) |
			      ((u32)data[3] <<  0);
			sbus_writel(val, &fbc->font);

			data += 4;
			x += 32;
			width -= 32;
		}
		if (width) {
			u32 val;

			sbus_writel(y, &fbc->y0);
			sbus_writel(x, &fbc->x0);
			sbus_writel(x + width - 1, &fbc->x1);
			if (width <= 8) {
				val = (u32) data[0] << 24;
				data += 1;
			} else if (width <= 16) {
				val = ((u32) data[0] << 24) |
				      ((u32) data[1] << 16);
				data += 2;
			} else {
				val = ((u32) data[0] << 24) |
				      ((u32) data[1] << 16) |
				      ((u32) data[2] <<  8);
				data += 3;
			}
			sbus_writel(val, &fbc->font);
		}

		y += 1;
		x = image->dx;
	}

	spin_unlock_irqrestore(&par->lock, flags);
}

/**
 *	cg6_setcolreg - Sets a color register.
 *
 *	@regno: boolean, 0 copy local, 1 get_user() function
 *	@red: frame buffer colormap structure
 *	@green: The green value which can be up to 16 bits wide
 *	@blue:  The blue value which can be up to 16 bits wide.
 *	@transp: If supported the alpha value which can be up to 16 bits wide.
 *	@info: frame buffer info structure
 */
static int cg6_setcolreg(unsigned regno,
			 unsigned red, unsigned green, unsigned blue,
			 unsigned transp, struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct bt_regs __iomem *bt = par->bt;
	unsigned long flags;

	if (regno >= 256)
		return 1;

	red >>= 8;
	green >>= 8;
	blue >>= 8;

	spin_lock_irqsave(&par->lock, flags);

	sbus_writel((u32)regno << 24, &bt->addr);
	sbus_writel((u32)red << 24, &bt->color_map);
	sbus_writel((u32)green << 24, &bt->color_map);
	sbus_writel((u32)blue << 24, &bt->color_map);

	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
}

/**
 *	cg6_blank - Blanks the display.
 *
 *	@blank_mode: the blank mode we want.
 *	@info: frame buffer structure that represents a single frame buffer
 */
static int cg6_blank(int blank, struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_thc __iomem *thc = par->thc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&par->lock, flags);
	val = sbus_readl(&thc->thc_misc);

	switch (blank) {
	case FB_BLANK_UNBLANK: /* Unblanking */
		val |= CG6_THC_MISC_VIDEO;
		par->flags &= ~CG6_FLAG_BLANKED;
		break;

	case FB_BLANK_NORMAL: /* Normal blanking */
	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
	case FB_BLANK_POWERDOWN: /* Poweroff */
		val &= ~CG6_THC_MISC_VIDEO;
		par->flags |= CG6_FLAG_BLANKED;
		break;
	}

	sbus_writel(val, &thc->thc_misc);
	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
}

static struct sbus_mmap_map cg6_mmap_map[] = {
	{
		.voff	= CG6_FBC,
		.poff	= CG6_FBC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_TEC,
		.poff	= CG6_TEC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_BTREGS,
		.poff	= CG6_BROOKTREE_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_FHC,
		.poff	= CG6_FHC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_THC,
		.poff	= CG6_THC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_ROM,
		.poff	= CG6_ROM_OFFSET,
		.size	= 0x10000
	},
	{
		.voff	= CG6_RAM,
		.poff	= CG6_RAM_OFFSET,
		.size	= SBUS_MMAP_FBSIZE(1)
	},
	{
		.voff	= CG6_DHC,
		.poff	= CG6_DHC_OFFSET,
		.size	= 0x40000
	},
	{ .size	= 0 }
};

static int cg6_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	struct cg6_par *par = (struct cg6_par *)info->par;

	return sbusfb_mmap_helper(cg6_mmap_map,
				  par->physbase, par->fbsize,
				  par->which_io, vma);
}

static int cg6_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
	struct cg6_par *par = (struct cg6_par *)info->par;

	return sbusfb_ioctl_helper(cmd, arg, info,
				   FBTYPE_SUNFAST_COLOR, 8, par->fbsize);
}

/*
 *  Initialisation
 */

static void __devinit cg6_init_fix(struct fb_info *info, int linebytes)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	const char *cg6_cpu_name, *cg6_card_name;
	u32 conf;

	conf = sbus_readl(par->fhc);
	switch (conf & CG6_FHC_CPU_MASK) {
	case CG6_FHC_CPU_SPARC:
		cg6_cpu_name = "sparc";
		break;
	case CG6_FHC_CPU_68020:
		cg6_cpu_name = "68020";
		break;
	default:
		cg6_cpu_name = "i386";
		break;
	};
	if (((conf >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK) >= 11) {
		if (par->fbsize <= 0x100000)
			cg6_card_name = "TGX";
		else
			cg6_card_name = "TGX+";
	} else {
		if (par->fbsize <= 0x100000)
			cg6_card_name = "GX";
		else
			cg6_card_name = "GX+";
	}

	sprintf(info->fix.id, "%s %s", cg6_card_name, cg6_cpu_name);
	info->fix.id[sizeof(info->fix.id) - 1] = 0;

	info->fix.type = FB_TYPE_PACKED_PIXELS;
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->fix.line_length = linebytes;

	info->fix.accel = FB_ACCEL_SUN_CGSIX;
}

/* Initialize Brooktree DAC */
static void __devinit cg6_bt_init(struct cg6_par *par)
{
	struct bt_regs __iomem *bt = par->bt;

	sbus_writel(0x04 << 24, &bt->addr);	 /* color planes */
	sbus_writel(0xff << 24, &bt->control);
	sbus_writel(0x05 << 24, &bt->addr);
	sbus_writel(0x00 << 24, &bt->control);
	sbus_writel(0x06 << 24, &bt->addr);	 /* overlay plane */
	sbus_writel(0x73 << 24, &bt->control);
	sbus_writel(0x07 << 24, &bt->addr);
	sbus_writel(0x00 << 24, &bt->control);
}

static void __devinit cg6_chip_init(struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_tec __iomem *tec = par->tec;
	struct cg6_fbc __iomem *fbc = par->fbc;
	u32 rev, conf, mode;
	int i;

	/* Turn off stuff in the Transform Engine. */
	sbus_writel(0, &tec->tec_matrix);
	sbus_writel(0, &tec->tec_clip);
	sbus_writel(0, &tec->tec_vdc);

	/* Take care of bugs in old revisions. */
	rev = (sbus_readl(par->fhc) >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK;
	if (rev < 5) {
		conf = (sbus_readl(par->fhc) & CG6_FHC_RES_MASK) |
			CG6_FHC_CPU_68020 | CG6_FHC_TEST |
			(11 << CG6_FHC_TEST_X_SHIFT) |
			(11 << CG6_FHC_TEST_Y_SHIFT);
		if (rev < 2)
			conf |= CG6_FHC_DST_DISABLE;
		sbus_writel(conf, par->fhc);
	}

	/* Set things in the FBC. Bad things appear to happen if we do
	 * back to back store/loads on the mode register, so copy it
	 * out instead. */
	mode = sbus_readl(&fbc->mode);
	do {
		i = sbus_readl(&fbc->s);
	} while (i & 0x10000000);
	mode &= ~(CG6_FBC_BLIT_MASK | CG6_FBC_MODE_MASK |
		  CG6_FBC_DRAW_MASK | CG6_FBC_BWRITE0_MASK |
		  CG6_FBC_BWRITE1_MASK | CG6_FBC_BREAD_MASK |
		  CG6_FBC_BDISP_MASK);
	mode |= (CG6_FBC_BLIT_SRC | CG6_FBC_MODE_COLOR8 |
		 CG6_FBC_DRAW_RENDER | CG6_FBC_BWRITE0_ENABLE |
		 CG6_FBC_BWRITE1_DISABLE | CG6_FBC_BREAD_0 |
		 CG6_FBC_BDISP_0);
	sbus_writel(mode, &fbc->mode);

	sbus_writel(0, &fbc->clip);
	sbus_writel(0, &fbc->offx);
	sbus_writel(0, &fbc->offy);
	sbus_writel(0, &fbc->clipminx);
	sbus_writel(0, &fbc->clipminy);
	sbus_writel(info->var.xres - 1, &fbc->clipmaxx);
	sbus_writel(info->var.yres - 1, &fbc->clipmaxy);
}

static void cg6_unmap_regs(struct of_device *op, struct fb_info *info,
			   struct cg6_par *par)
{
	if (par->fbc)
		of_iounmap(&op->resource[0], par->fbc, 4096);
	if (par->tec)
		of_iounmap(&op->resource[0], par->tec, sizeof(struct cg6_tec));
	if (par->thc)
		of_iounmap(&op->resource[0], par->thc, sizeof(struct cg6_thc));
	if (par->bt)
		of_iounmap(&op->resource[0], par->bt, sizeof(struct bt_regs));
	if (par->fhc)
		of_iounmap(&op->resource[0], par->fhc, sizeof(u32));

	if (info->screen_base)
		of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
}

static int __devinit cg6_probe(struct of_device *op,
				const struct of_device_id *match)
{
	struct device_node *dp = op->node;
	struct fb_info *info;
	struct cg6_par *par;
	int linebytes, err;
	int dblbuf;

	info = framebuffer_alloc(sizeof(struct cg6_par), &op->dev);

	err = -ENOMEM;
	if (!info)
		goto out_err;
	par = info->par;

	spin_lock_init(&par->lock);

	par->physbase = op->resource[0].start;
	par->which_io = op->resource[0].flags & IORESOURCE_BITS;

	sbusfb_fill_var(&info->var, dp, 8);
	info->var.red.length = 8;
	info->var.green.length = 8;
	info->var.blue.length = 8;

	linebytes = of_getintprop_default(dp, "linebytes",
					  info->var.xres);
	par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);

	dblbuf = of_getintprop_default(dp, "dblbuf", 0);
	if (dblbuf)
		par->fbsize *= 4;

	par->fbc = of_ioremap(&op->resource[0], CG6_FBC_OFFSET,
				4096, "cgsix fbc");
	par->tec = of_ioremap(&op->resource[0], CG6_TEC_OFFSET,
				sizeof(struct cg6_tec), "cgsix tec");
	par->thc = of_ioremap(&op->resource[0], CG6_THC_OFFSET,
				sizeof(struct cg6_thc), "cgsix thc");
	par->bt = of_ioremap(&op->resource[0], CG6_BROOKTREE_OFFSET,
				sizeof(struct bt_regs), "cgsix dac");
	par->fhc = of_ioremap(&op->resource[0], CG6_FHC_OFFSET,
				sizeof(u32), "cgsix fhc");

	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_IMAGEBLIT |
			FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT |
			FBINFO_READS_FAST;
	info->fbops = &cg6_ops;

	info->screen_base = of_ioremap(&op->resource[0], CG6_RAM_OFFSET,
					par->fbsize, "cgsix ram");
	if (!par->fbc || !par->tec || !par->thc ||
	    !par->bt || !par->fhc || !info->screen_base)
		goto out_unmap_regs;

	info->var.accel_flags = FB_ACCELF_TEXT;

	cg6_bt_init(par);
	cg6_chip_init(info);
	cg6_blank(FB_BLANK_UNBLANK, info);

	if (fb_alloc_cmap(&info->cmap, 256, 0))
		goto out_unmap_regs;

	fb_set_cmap(&info->cmap, info);
	cg6_init_fix(info, linebytes);

	err = register_framebuffer(info);
	if (err < 0)
		goto out_dealloc_cmap;

	dev_set_drvdata(&op->dev, info);

	printk(KERN_INFO "%s: CGsix [%s] at %lx:%lx\n",
	       dp->full_name, info->fix.id,
	       par->which_io, par->physbase);

	return 0;

out_dealloc_cmap:
	fb_dealloc_cmap(&info->cmap);

out_unmap_regs:
	cg6_unmap_regs(op, info, par);

out_err:
	return err;
}

static int __devexit cg6_remove(struct of_device *op)
{
	struct fb_info *info = dev_get_drvdata(&op->dev);
	struct cg6_par *par = info->par;

	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);

	cg6_unmap_regs(op, info, par);

	framebuffer_release(info);

	dev_set_drvdata(&op->dev, NULL);

	return 0;
}

static const struct of_device_id cg6_match[] = {
	{
		.name = "cgsix",
	},
	{
		.name = "cgthree+",
	},
	{},
};
MODULE_DEVICE_TABLE(of, cg6_match);

static struct of_platform_driver cg6_driver = {
	.name		= "cg6",
	.match_table	= cg6_match,
	.probe		= cg6_probe,
	.remove		= __devexit_p(cg6_remove),
};

static int __init cg6_init(void)
{
	if (fb_get_options("cg6fb", NULL))
		return -ENODEV;

	return of_register_driver(&cg6_driver, &of_bus_type);
}

static void __exit cg6_exit(void)
{
	of_unregister_driver(&cg6_driver);
}

module_init(cg6_init);
module_exit(cg6_exit);

MODULE_DESCRIPTION("framebuffer driver for CGsix chipsets");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");